FM / unicode

/usr/include/unicode

Name	Size	Mode	Actions
alphaindex.h	27158	0644	edit dl rm
appendable.h	8739	0644	edit dl rm
basictz.h	10163	0644	edit dl rm
brkiter.h	28478	0644	edit dl rm
bytestream.h	11013	0644	edit dl rm
bytestrie.h	21268	0644	edit dl rm
bytestriebuilder.h	7640	0644	edit dl rm
calendar.h	108424	0644	edit dl rm
caniter.h	7621	0644	edit dl rm
casemap.h	25933	0644	edit dl rm
char16ptr.h	7393	0644	edit dl rm
chariter.h	24638	0644	edit dl rm
choicfmt.h	24544	0644	edit dl rm
coleitr.h	14102	0644	edit dl rm
coll.h	57615	0644	edit dl rm
compactdecimalformat.h	7047	0644	edit dl rm
curramt.h	3869	0644	edit dl rm
currpinf.h	7479	0644	edit dl rm
currunit.h	4112	0644	edit dl rm
datefmt.h	41690	0644	edit dl rm
dbbi.h	1223	0644	edit dl rm
dcfmtsym.h	21101	0644	edit dl rm
decimfmt.h	89676	0644	edit dl rm
docmain.h	7380	0644	edit dl rm
dtfmtsym.h	39126	0644	edit dl rm
dtintrv.h	3935	0644	edit dl rm
dtitvfmt.h	50448	0644	edit dl rm
dtitvinf.h	19072	0644	edit dl rm
dtptngen.h	26692	0644	edit dl rm
dtrule.h	8898	0644	edit dl rm
edits.h	21237	0644	edit dl rm
enumset.h	2130	0644	edit dl rm
errorcode.h	4956	0644	edit dl rm
fieldpos.h	8906	0644	edit dl rm
filteredbrk.h	5501	0644	edit dl rm
fmtable.h	25020	0644	edit dl rm
format.h	12802	0644	edit dl rm
formattedvalue.h	9987	0644	edit dl rm
fpositer.h	3107	0644	edit dl rm
gender.h	3408	0644	edit dl rm
gregocal.h	32642	0644	edit dl rm
icudataver.h	1049	0644	edit dl rm
icuplug.h	12109	0644	edit dl rm
idna.h	13000	0644	edit dl rm
listformatter.h	9004	0644	edit dl rm
localebuilder.h	11350	0644	edit dl rm
localematcher.h	27467	0644	edit dl rm
localpointer.h	19825	0644	edit dl rm
locdspnm.h	7292	0644	edit dl rm
locid.h	48804	0644	edit dl rm
measfmt.h	11690	0644	edit dl rm
measunit.h	107613	0644	edit dl rm
measure.h	4431	0644	edit dl rm
messagepattern.h	34517	0644	edit dl rm
msgfmt.h	45278	0644	edit dl rm
normalizer2.h	34466	0644	edit dl rm
normlzr.h	31690	0644	edit dl rm
nounit.h	2305	0644	edit dl rm
numberformatter.h	94505	0644	edit dl rm
numberrangeformatter.h	25790	0644	edit dl rm
numfmt.h	51034	0644	edit dl rm
numsys.h	7509	0644	edit dl rm
parseerr.h	3155	0644	edit dl rm
parsepos.h	5699	0644	edit dl rm
platform.h	28768	0644	edit dl rm
plurfmt.h	25847	0644	edit dl rm
plurrule.h	21316	0644	edit dl rm
ptypes.h	3577	0644	edit dl rm
putil.h	6471	0644	edit dl rm
rbbi.h	28413	0644	edit dl rm
rbnf.h	50021	0644	edit dl rm
rbtz.h	16210	0644	edit dl rm
regex.h	86385	0644	edit dl rm
region.h	9402	0644	edit dl rm
reldatefmt.h	22751	0644	edit dl rm
rep.h	9599	0644	edit dl rm
resbund.h	18513	0644	edit dl rm
schriter.h	6511	0644	edit dl rm
scientificnumberformatter.h	6589	0644	edit dl rm
search.h	22755	0644	edit dl rm
selfmt.h	14686	0644	edit dl rm
simpleformatter.h	12888	0644	edit dl rm
simpletz.h	46798	0644	edit dl rm
smpdtfmt.h	72778	0644	edit dl rm
sortkey.h	11452	0644	edit dl rm
std_string.h	1076	0644	edit dl rm
strenum.h	10157	0644	edit dl rm
stringoptions.h	5926	0644	edit dl rm
stringpiece.h	10287	0644	edit dl rm
stringtriebuilder.h	15842	0644	edit dl rm
stsearch.h	21926	0644	edit dl rm
symtable.h	4374	0644	edit dl rm
tblcoll.h	37801	0644	edit dl rm
timezone.h	44858	0644	edit dl rm
tmunit.h	3479	0644	edit dl rm
tmutamt.h	5029	0644	edit dl rm
tmutfmt.h	7602	0644	edit dl rm
translit.h	67397	0644	edit dl rm
tzfmt.h	43961	0644	edit dl rm
tznames.h	17251	0644	edit dl rm
tzrule.h	36450	0644	edit dl rm
tztrans.h	6278	0644	edit dl rm
ubidi.h	91759	0644	edit dl rm
ubiditransform.h	13003	0644	edit dl rm
ubrk.h	25043	0644	edit dl rm
ucal.h	62463	0644	edit dl rm
ucasemap.h	15579	0644	edit dl rm
ucat.h	5478	0644	edit dl rm
uchar.h	148111	0644	edit dl rm
ucharstrie.h	23066	0644	edit dl rm
ucharstriebuilder.h	7645	0644	edit dl rm
uchriter.h	13747	0644	edit dl rm
uclean.h	11468	0644	edit dl rm
ucnv.h	85051	0644	edit dl rm
ucnvsel.h	6339	0644	edit dl rm
ucnv_cb.h	6738	0644	edit dl rm
ucnv_err.h	21481	0644	edit dl rm
ucol.h	62987	0644	edit dl rm
ucoleitr.h	10056	0644	edit dl rm
uconfig.h	12356	0644	edit dl rm
ucpmap.h	5663	0644	edit dl rm
ucptrie.h	23044	0644	edit dl rm
ucsdet.h	15043	0644	edit dl rm
ucurr.h	17122	0644	edit dl rm
udat.h	63902	0644	edit dl rm
udata.h	16004	0644	edit dl rm
udateintervalformat.h	12218	0644	edit dl rm
udatpg.h	27405	0644	edit dl rm
udisplaycontext.h	6084	0644	edit dl rm
uenum.h	7981	0644	edit dl rm
ufieldpositer.h	4513	0644	edit dl rm
uformattable.h	11233	0644	edit dl rm
uformattedvalue.h	12600	0644	edit dl rm
ugender.h	2106	0644	edit dl rm
uidna.h	34229	0644	edit dl rm
uiter.h	23299	0644	edit dl rm
uldnames.h	10733	0644	edit dl rm
ulistformatter.h	11043	0644	edit dl rm
uloc.h	55936	0644	edit dl rm
ulocdata.h	11572	0644	edit dl rm
umachine.h	16439	0644	edit dl rm
umisc.h	1365	0644	edit dl rm
umsg.h	24832	0644	edit dl rm
umutablecptrie.h	8490	0644	edit dl rm
unifilt.h	4091	0644	edit dl rm
unifunct.h	4151	0644	edit dl rm
unimatch.h	6244	0644	edit dl rm
unirepl.h	3464	0644	edit dl rm
uniset.h	68108	0644	edit dl rm
unistr.h	174627	0644	edit dl rm
unorm.h	21042	0644	edit dl rm
unorm2.h	25269	0644	edit dl rm
unum.h	56269	0644	edit dl rm
unumberformatter.h	31177	0644	edit dl rm
unumberrangeformatter.h	15737	0644	edit dl rm
unumsys.h	7430	0644	edit dl rm
uobject.h	10934	0644	edit dl rm
upluralrules.h	8997	0644	edit dl rm
uregex.h	73719	0644	edit dl rm
uregion.h	10047	0644	edit dl rm
ureldatefmt.h	17448	0644	edit dl rm
urename.h	137853	0644	edit dl rm
urep.h	5507	0644	edit dl rm
ures.h	37418	0644	edit dl rm
uscript.h	28291	0644	edit dl rm
usearch.h	40153	0644	edit dl rm
uset.h	45503	0644	edit dl rm
usetiter.h	9910	0644	edit dl rm
ushape.h	18430	0644	edit dl rm
uspoof.h	67425	0644	edit dl rm
usprep.h	8382	0644	edit dl rm
ustdio.h	39482	0644	edit dl rm
ustream.h	1934	0644	edit dl rm
ustring.h	74096	0644	edit dl rm
ustringtrie.h	3224	0644	edit dl rm
utext.h	59471	0644	edit dl rm
utf.h	8057	0644	edit dl rm
utf8.h	31572	0644	edit dl rm
utf16.h	23910	0644	edit dl rm
utf32.h	763	0644	edit dl rm
utf_old.h	46929	0644	edit dl rm
utmscale.h	14107	0644	edit dl rm
utrace.h	17595	0644	edit dl rm
utrans.h	26157	0644	edit dl rm
utypes.h	31807	0644	edit dl rm
uvernum.h	6839	0644	edit dl rm
uversion.h	6137	0644	edit dl rm
vtzone.h	21303	0644	edit dl rm

Edit: /usr/include/unicode/localematcher.h (27467B)

// © 2019 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html

// localematcher.h
// created: 2019may08 Markus W. Scherer

#ifndef __LOCALEMATCHER_H__
#define __LOCALEMATCHER_H__

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

#include "unicode/locid.h"
#include "unicode/stringpiece.h"
#include "unicode/uobject.h"

/**
 * \file
 * \brief C++ API: Locale matcher: User's desired locales vs. application's supported locales.
 */

/**
 * Builder option for whether the language subtag or the script subtag is most important.
 *
 * @see LocaleMatcher::Builder#setFavorSubtag(ULocMatchFavorSubtag)
 * @stable ICU 65
 */
enum ULocMatchFavorSubtag {
    /**
     * Language differences are most important, then script differences, then region differences.
     * (This is the default behavior.)
     *
     * @stable ICU 65
     */
    ULOCMATCH_FAVOR_LANGUAGE,
    /**
     * Makes script differences matter relatively more than language differences.
     *
     * @stable ICU 65
     */
    ULOCMATCH_FAVOR_SCRIPT
};
#ifndef U_IN_DOXYGEN
typedef enum ULocMatchFavorSubtag ULocMatchFavorSubtag;
#endif

/**
 * Builder option for whether all desired locales are treated equally or
 * earlier ones are preferred.
 *
 * @see LocaleMatcher::Builder#setDemotionPerDesiredLocale(ULocMatchDemotion)
 * @stable ICU 65
 */
enum ULocMatchDemotion {
 /**
 * All desired locales are treated equally.
 *
 * @stable ICU 65
 */
 ULOCMATCH_DEMOTION_NONE,
 /**
 * Earlier desired locales are preferred.
 *
 * From each desired locale to the next,
 * the distance to any supported locale is increased by an additional amount
 * which is at least as large as most region mismatches.
 * A later desired locale has to have a better match with some supported locale
 * due to more than merely having the same region subtag.
 *
 * For example: <code>Supported={en, sv} desired=[en-GB, sv]</code>
 * yields <code>Result(en-GB, en)</code> because
 * with the demotion of sv its perfect match is no better than
 * the region distance between the earlier desired locale en-GB and en=en-US.
 *
 * Notes:
 * <ul>
 * <li>In some cases, language and/or script differences can be as small as
 * the typical region difference. (Example: sr-Latn vs. sr-Cyrl)
 * <li>It is possible for certain region differences to be larger than usual,
 * and larger than the demotion.
 * (As of CLDR 35 there is no such case, but
 * this is possible in future versions of the data.)
 * </ul>
 *
 * @stable ICU 65
 */
 ULOCMATCH_DEMOTION_REGION
};
#ifndef U_IN_DOXYGEN
typedef enum ULocMatchDemotion ULocMatchDemotion;
#endif

/**
 * Builder option for whether to include or ignore one-way (fallback) match data.
 * The LocaleMatcher uses CLDR languageMatch data which includes fallback (oneway=true) entries.
 * Sometimes it is desirable to ignore those.
 *
 * For example, consider a web application with the UI in a given language,
 * with a link to another, related web app.
 * The link should include the UI language, and the target server may also use
 * the client’s Accept-Language header data.
 * The target server has its own list of supported languages.
 * One may want to favor UI language consistency, that is,
 * if there is a decent match for the original UI language, we want to use it,
 * but not if it is merely a fallback.
 *
 * @see LocaleMatcher::Builder#setDirection(ULocMatchDirection)
 * @stable ICU 67
 */
enum ULocMatchDirection {
 /**
 * Locale matching includes one-way matches such as Breton→French. (default)
 *
 * @stable ICU 67
 */
 ULOCMATCH_DIRECTION_WITH_ONE_WAY,
 /**
 * Locale matching limited to two-way matches including e.g. Danish↔Norwegian
 * but ignoring one-way matches.
 *
 * @stable ICU 67
 */
 ULOCMATCH_DIRECTION_ONLY_TWO_WAY
};
#ifndef U_IN_DOXYGEN
typedef enum ULocMatchDirection ULocMatchDirection;
#endif

struct UHashtable;

U_NAMESPACE_BEGIN

struct LSR;

class LocaleDistance;
class LocaleLsrIterator;
class UVector;
class XLikelySubtags;

/**
 * Immutable class that picks the best match between a user's desired locales and
 * an application's supported locales.
 * Movable but not copyable.
 *
 * Example:
 * <pre>
 * UErrorCode errorCode = U_ZERO_ERROR;
 * LocaleMatcher matcher = LocaleMatcher::Builder().setSupportedLocales("fr, en-GB, en").build(errorCode);
 * Locale *bestSupported = matcher.getBestLocale(Locale.US, errorCode); // "en"
 * </pre>
 *
 * A matcher takes into account when languages are close to one another,
 * such as Danish and Norwegian,
 * and when regional variants are close, like en-GB and en-AU as opposed to en-US.
 *
 * If there are multiple supported locales with the same (language, script, region)
 * likely subtags, then the current implementation returns the first of those locales.
 * It ignores variant subtags (except for pseudolocale variants) and extensions.
 * This may change in future versions.
 *
 * For example, the current implementation does not distinguish between
 * de, de-DE, de-Latn, de-1901, de-u-co-phonebk.
 *
 * If you prefer one equivalent locale over another, then provide only the preferred one,
 * or place it earlier in the list of supported locales.
 *
 * Otherwise, the order of supported locales may have no effect on the best-match results.
 * The current implementation compares each desired locale with supported locales
 * in the following order:
 * 1. Default locale, if supported;
 * 2. CLDR "paradigm locales" like en-GB and es-419;
 * 3. other supported locales.
 * This may change in future versions.
 *
 * Often a product will just need one matcher instance, built with the languages
 * that it supports. However, it may want multiple instances with different
 * default languages based on additional information, such as the domain.
 *
 * This class is not intended for public subclassing.
 *
 * @stable ICU 65
 */
class U_COMMON_API LocaleMatcher : public UMemory {
public:
 /**
 * Data for the best-matching pair of a desired and a supported locale.
 * Movable but not copyable.
 *
 * @stable ICU 65
 */
 class U_COMMON_API Result : public UMemory {
 public:
 /**
 * Move constructor; might modify the source.
 * This object will have the same contents that the source object had.
 *
 * @param src Result to move contents from.
 * @stable ICU 65
 */
 Result(Result &&src) U_NOEXCEPT;

/**
         * Destructor.
         *
         * @stable ICU 65
         */
        ~Result();

/**
         * Move assignment; might modify the source.
         * This object will have the same contents that the source object had.
         *
         * @param src Result to move contents from.
         * @stable ICU 65
         */
        Result &operator=(Result &&src) U_NOEXCEPT;

/**
         * Returns the best-matching desired locale.
         * nullptr if the list of desired locales is empty or if none matched well enough.
         *
         * @return the best-matching desired locale, or nullptr.
         * @stable ICU 65
         */
        inline const Locale *getDesiredLocale() const { return desiredLocale; }

/**
         * Returns the best-matching supported locale.
         * If none matched well enough, this is the default locale.
         * The default locale is nullptr if Builder::setNoDefaultLocale() was called,
         * or if the list of supported locales is empty and no explicit default locale is set.
         *
         * @return the best-matching supported locale, or nullptr.
         * @stable ICU 65
         */
        inline const Locale *getSupportedLocale() const { return supportedLocale; }

/**
         * Returns the index of the best-matching desired locale in the input Iterable order.
         * -1 if the list of desired locales is empty or if none matched well enough.
         *
         * @return the index of the best-matching desired locale, or -1.
         * @stable ICU 65
         */
        inline int32_t getDesiredIndex() const { return desiredIndex; }

/**
         * Returns the index of the best-matching supported locale in the
         * constructor’s or builder’s input order (“set” Collection plus “added” locales).
         * If the matcher was built from a locale list string, then the iteration order is that
         * of a LocalePriorityList built from the same string.
         * -1 if the list of supported locales is empty or if none matched well enough.
         *
         * @return the index of the best-matching supported locale, or -1.
         * @stable ICU 65
         */
        inline int32_t getSupportedIndex() const { return supportedIndex; }

/**
 * Takes the best-matching supported locale and adds relevant fields of the
 * best-matching desired locale, such as the -t- and -u- extensions.
 * May replace some fields of the supported locale.
 * The result is the locale that should be used for date and number formatting, collation, etc.
 * Returns the root locale if getSupportedLocale() returns nullptr.
 *
 * Example: desired=ar-SA-u-nu-latn, supported=ar-EG, resolved locale=ar-SA-u-nu-latn
 *
 * @return a locale combining the best-matching desired and supported locales.
 * @stable ICU 65
 */
 Locale makeResolvedLocale(UErrorCode &errorCode) const;

private:
        Result(const Locale *desired, const Locale *supported,
               int32_t desIndex, int32_t suppIndex, UBool owned) :
                desiredLocale(desired), supportedLocale(supported),
                desiredIndex(desIndex), supportedIndex(suppIndex),
                desiredIsOwned(owned) {}

Result(const Result &other) = delete;
        Result &operator=(const Result &other) = delete;

const Locale *desiredLocale;
        const Locale *supportedLocale;
        int32_t desiredIndex;
        int32_t supportedIndex;
        UBool desiredIsOwned;

friend class LocaleMatcher;
    };

/**
     * LocaleMatcher builder.
     * Movable but not copyable.
     *
     * @stable ICU 65
     */
    class U_COMMON_API Builder : public UMemory {
    public:
        /**
         * Constructs a builder used in chaining parameters for building a LocaleMatcher.
         *
         * @return a new Builder object
         * @stable ICU 65
         */
        Builder() {}

/**
         * Move constructor; might modify the source.
         * This builder will have the same contents that the source builder had.
         *
         * @param src Builder to move contents from.
         * @stable ICU 65
         */
        Builder(Builder &&src) U_NOEXCEPT;

/**
         * Destructor.
         *
         * @stable ICU 65
         */
        ~Builder();

/**
         * Move assignment; might modify the source.
         * This builder will have the same contents that the source builder had.
         *
         * @param src Builder to move contents from.
         * @stable ICU 65
         */
        Builder &operator=(Builder &&src) U_NOEXCEPT;

/**
 * Parses an Accept-Language string
 * (<a href="https://tools.ietf.org/html/rfc2616#section-14.4">RFC 2616 Section 14.4</a>),
 * such as "af, en, fr;q=0.9", and sets the supported locales accordingly.
 * Allows whitespace in more places but does not allow "*".
 * Clears any previously set/added supported locales first.
 *
 * @param locales the Accept-Language string of locales to set
 * @return this Builder object
 * @stable ICU 65
 */
 Builder &setSupportedLocalesFromListString(StringPiece locales);

/**
         * Copies the supported locales, preserving iteration order.
         * Clears any previously set/added supported locales first.
         * Duplicates are allowed, and are not removed.
         *
         * @param locales the list of locale
         * @return this Builder object
         * @stable ICU 65
         */
        Builder &setSupportedLocales(Locale::Iterator &locales);

/**
 * Copies the supported locales from the begin/end range, preserving iteration order.
 * Clears any previously set/added supported locales first.
 * Duplicates are allowed, and are not removed.
 *
 * Each of the iterator parameter values must be an
 * input iterator whose value is convertible to const Locale &.
 *
 * @param begin Start of range.
 * @param end Exclusive end of range.
 * @return this Builder object
 * @stable ICU 65
 */
 template<typename Iter>
 Builder &setSupportedLocales(Iter begin, Iter end) {
 if (U_FAILURE(errorCode_)) { return *this; }
 clearSupportedLocales();
 while (begin != end) {
 addSupportedLocale(*begin++);
 }
 return *this;
 }

/**
 * Copies the supported locales from the begin/end range, preserving iteration order.
 * Calls the converter to convert each *begin to a Locale or const Locale &.
 * Clears any previously set/added supported locales first.
 * Duplicates are allowed, and are not removed.
 *
 * Each of the iterator parameter values must be an
 * input iterator whose value is convertible to const Locale &.
 *
 * @param begin Start of range.
 * @param end Exclusive end of range.
 * @param converter Converter from *begin to const Locale & or compatible.
 * @return this Builder object
 * @stable ICU 65
 */
 template<typename Iter, typename Conv>
 Builder &setSupportedLocalesViaConverter(Iter begin, Iter end, Conv converter) {
 if (U_FAILURE(errorCode_)) { return *this; }
 clearSupportedLocales();
 while (begin != end) {
 addSupportedLocale(converter(*begin++));
 }
 return *this;
 }

/**
         * Adds another supported locale.
         * Duplicates are allowed, and are not removed.
         *
         * @param locale another locale
         * @return this Builder object
         * @stable ICU 65
         */
        Builder &addSupportedLocale(const Locale &locale);

/**
         * Sets no default locale.
         * There will be no explicit or implicit default locale.
         * If there is no good match, then the matcher will return nullptr for the
         * best supported locale.
         *
         * @stable ICU 68
         */
        Builder &setNoDefaultLocale();

/**
         * Sets the default locale; if nullptr, or if it is not set explicitly,
         * then the first supported locale is used as the default locale.
         * There is no default locale at all (nullptr will be returned instead)
         * if setNoDefaultLocale() is called.
         *
         * @param defaultLocale the default locale (will be copied)
         * @return this Builder object
         * @stable ICU 65
         */
        Builder &setDefaultLocale(const Locale *defaultLocale);

/**
         * If ULOCMATCH_FAVOR_SCRIPT, then the language differences are smaller than script
         * differences.
         * This is used in situations (such as maps) where
         * it is better to fall back to the same script than a similar language.
         *
         * @param subtag the subtag to favor
         * @return this Builder object
         * @stable ICU 65
         */
        Builder &setFavorSubtag(ULocMatchFavorSubtag subtag);

/**
         * Option for whether all desired locales are treated equally or
         * earlier ones are preferred (this is the default).
         *
         * @param demotion the demotion per desired locale to set.
         * @return this Builder object
         * @stable ICU 65
         */
        Builder &setDemotionPerDesiredLocale(ULocMatchDemotion demotion);

/**
         * Option for whether to include or ignore one-way (fallback) match data.
         * By default, they are included.
         *
         * @param direction the match direction to set.
         * @return this Builder object
         * @stable ICU 67
         */
        Builder &setDirection(ULocMatchDirection direction) {
            if (U_SUCCESS(errorCode_)) {
                direction_ = direction;
            }
            return *this;
        }

/**
         * Sets the maximum distance for an acceptable match.
         * The matcher will return a match for a pair of locales only if
         * they match at least as well as the pair given here.
         *
         * For example, setMaxDistance(en-US, en-GB) limits matches to ones where the
         * (desired, support) locales have a distance no greater than a region subtag difference.
         * This is much stricter than the CLDR default.
         *
         * The details of locale matching are subject to changes in
         * CLDR data and in the algorithm.
         * Specifying a maximum distance in relative terms via a sample pair of locales
         * insulates from changes that affect all distance metrics similarly,
         * but some changes will necessarily affect relative distances between
         * different pairs of locales.
         *
         * @param desired the desired locale for distance comparison.
         * @param supported the supported locale for distance comparison.
         * @return this Builder object
         * @stable ICU 68
         */
        Builder &setMaxDistance(const Locale &desired, const Locale &supported);

/**
         * Sets the UErrorCode if an error occurred while setting parameters.
         * Preserves older error codes in the outErrorCode.
         *
         * @param outErrorCode Set to an error code if it does not contain one already
         *                  and an error occurred while setting parameters.
         *                  Otherwise unchanged.
         * @return true if U_FAILURE(outErrorCode)
         * @stable ICU 65
         */
        UBool copyErrorTo(UErrorCode &outErrorCode) const;

/**
         * Builds and returns a new locale matcher.
         * This builder can continue to be used.
         *
         * @param errorCode ICU error code. Its input value must pass the U_SUCCESS() test,
         *                  or else the function returns immediately. Check for U_FAILURE()
         *                  on output or use with function chaining. (See User Guide for details.)
         * @return LocaleMatcher
         * @stable ICU 65
         */
        LocaleMatcher build(UErrorCode &errorCode) const;

private:
        friend class LocaleMatcher;

Builder(const Builder &other) = delete;
        Builder &operator=(const Builder &other) = delete;

void clearSupportedLocales();
        bool ensureSupportedLocaleVector();

UErrorCode errorCode_ = U_ZERO_ERROR;
        UVector *supportedLocales_ = nullptr;
        int32_t thresholdDistance_ = -1;
        ULocMatchDemotion demotion_ = ULOCMATCH_DEMOTION_REGION;
        Locale *defaultLocale_ = nullptr;
        bool withDefault_ = true;
        ULocMatchFavorSubtag favor_ = ULOCMATCH_FAVOR_LANGUAGE;
        ULocMatchDirection direction_ = ULOCMATCH_DIRECTION_WITH_ONE_WAY;
        Locale *maxDistanceDesired_ = nullptr;
        Locale *maxDistanceSupported_ = nullptr;
    };

// FYI No public LocaleMatcher constructors in C++; use the Builder.

/**
     * Move copy constructor; might modify the source.
     * This matcher will have the same settings that the source matcher had.
     * @param src source matcher
     * @stable ICU 65
     */
    LocaleMatcher(LocaleMatcher &&src) U_NOEXCEPT;

/**
     * Destructor.
     * @stable ICU 65
     */
    ~LocaleMatcher();

/**
     * Move assignment operator; might modify the source.
     * This matcher will have the same settings that the source matcher had.
     * The behavior is undefined if *this and src are the same object.
     * @param src source matcher
     * @return *this
     * @stable ICU 65
     */
    LocaleMatcher &operator=(LocaleMatcher &&src) U_NOEXCEPT;

/**
     * Returns the supported locale which best matches the desired locale.
     *
     * @param desiredLocale Typically a user's language.
     * @param errorCode ICU error code. Its input value must pass the U_SUCCESS() test,
     *                  or else the function returns immediately. Check for U_FAILURE()
     *                  on output or use with function chaining. (See User Guide for details.)
     * @return the best-matching supported locale.
     * @stable ICU 65
     */
    const Locale *getBestMatch(const Locale &desiredLocale, UErrorCode &errorCode) const;

/**
     * Returns the supported locale which best matches one of the desired locales.
     *
     * @param desiredLocales Typically a user's languages, in order of preference (descending).
     * @param errorCode ICU error code. Its input value must pass the U_SUCCESS() test,
     *                  or else the function returns immediately. Check for U_FAILURE()
     *                  on output or use with function chaining. (See User Guide for details.)
     * @return the best-matching supported locale.
     * @stable ICU 65
     */
    const Locale *getBestMatch(Locale::Iterator &desiredLocales, UErrorCode &errorCode) const;

/**
 * Parses an Accept-Language string
 * (<a href="https://tools.ietf.org/html/rfc2616#section-14.4">RFC 2616 Section 14.4</a>),
 * such as "af, en, fr;q=0.9",
 * and returns the supported locale which best matches one of the desired locales.
 * Allows whitespace in more places but does not allow "*".
 *
 * @param desiredLocaleList Typically a user's languages, as an Accept-Language string.
 * @param errorCode ICU error code. Its input value must pass the U_SUCCESS() test,
 * or else the function returns immediately. Check for U_FAILURE()
 * on output or use with function chaining. (See User Guide for details.)
 * @return the best-matching supported locale.
 * @stable ICU 65
 */
 const Locale *getBestMatchForListString(StringPiece desiredLocaleList, UErrorCode &errorCode) const;

/**
     * Returns the best match between the desired locale and the supported locales.
     * If the result's desired locale is not nullptr, then it is the address of the input locale.
     * It has not been cloned.
     *
     * @param desiredLocale Typically a user's language.
     * @param errorCode ICU error code. Its input value must pass the U_SUCCESS() test,
     *                  or else the function returns immediately. Check for U_FAILURE()
     *                  on output or use with function chaining. (See User Guide for details.)
     * @return the best-matching pair of the desired and a supported locale.
     * @stable ICU 65
     */
    Result getBestMatchResult(const Locale &desiredLocale, UErrorCode &errorCode) const;

/**
     * Returns the best match between the desired and supported locales.
     * If the result's desired locale is not nullptr, then it is a clone of
     * the best-matching desired locale. The Result object owns the clone.
     *
     * @param desiredLocales Typically a user's languages, in order of preference (descending).
     * @param errorCode ICU error code. Its input value must pass the U_SUCCESS() test,
     *                  or else the function returns immediately. Check for U_FAILURE()
     *                  on output or use with function chaining. (See User Guide for details.)
     * @return the best-matching pair of a desired and a supported locale.
     * @stable ICU 65
     */
    Result getBestMatchResult(Locale::Iterator &desiredLocales, UErrorCode &errorCode) const;

/**
     * Returns true if the pair of locales matches acceptably.
     * This is influenced by Builder options such as setDirection(), setFavorSubtag(),
     * and setMaxDistance().
     *
     * @param desired The desired locale.
     * @param supported The supported locale.
     * @param errorCode ICU error code. Its input value must pass the U_SUCCESS() test,
     *                  or else the function returns immediately. Check for U_FAILURE()
     *                  on output or use with function chaining. (See User Guide for details.)
     * @return true if the pair of locales matches acceptably.
     * @stable ICU 68
     */
    UBool isMatch(const Locale &desired, const Locale &supported, UErrorCode &errorCode) const;

#ifndef U_HIDE_INTERNAL_API
 /**
 * Returns a fraction between 0 and 1, where 1 means that the languages are a
 * perfect match, and 0 means that they are completely different.
 *
 * This is mostly an implementation detail, and the precise values may change over time.
 * The implementation may use either the maximized forms or the others ones, or both.
 * The implementation may or may not rely on the forms to be consistent with each other.
 *
 * Callers should construct and use a matcher rather than match pairs of locales directly.
 *
 * @param desired Desired locale.
 * @param supported Supported locale.
 * @param errorCode ICU error code. Its input value must pass the U_SUCCESS() test,
 * or else the function returns immediately. Check for U_FAILURE()
 * on output or use with function chaining. (See User Guide for details.)
 * @return value between 0 and 1, inclusive.
 * @internal (has a known user)
 */
 double internalMatch(const Locale &desired, const Locale &supported, UErrorCode &errorCode) const;
#endif // U_HIDE_INTERNAL_API

private:
    LocaleMatcher(const Builder &builder, UErrorCode &errorCode);
    LocaleMatcher(const LocaleMatcher &other) = delete;
    LocaleMatcher &operator=(const LocaleMatcher &other) = delete;

int32_t putIfAbsent(const LSR &lsr, int32_t i, int32_t suppLength, UErrorCode &errorCode);

int32_t getBestSuppIndex(LSR desiredLSR, LocaleLsrIterator *remainingIter, UErrorCode &errorCode) const;

const XLikelySubtags &likelySubtags;
    const LocaleDistance &localeDistance;
    int32_t thresholdDistance;
    int32_t demotionPerDesiredLocale;
    ULocMatchFavorSubtag favorSubtag;
    ULocMatchDirection direction;

// These are in input order.
 const Locale ** supportedLocales;
 LSR *lsrs;
 int32_t supportedLocalesLength;
 // These are in preference order: 1. Default locale 2. paradigm locales 3. others.
 UHashtable *supportedLsrToIndex; // Map<LSR, Integer>
 // Array versions of the supportedLsrToIndex keys and values.
 // The distance lookup loops over the supportedLSRs and returns the index of the best match.
 const LSR **supportedLSRs;
 int32_t *supportedIndexes;
 int32_t supportedLSRsLength;
 Locale *ownedDefaultLocale;
 const Locale *defaultLocale;
};

U_NAMESPACE_END

#endif  // U_SHOW_CPLUSPLUS_API
#endif  // __LOCALEMATCHER_H__

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